Regarding the question of spectacle lenses, what are the differences between spectacle lenses

Hello, I need a pair of mid-range glasses, not only for vision correction, but also as a decoration. There are many brands of lenses, and each optical store is different, but some big brands such as Essilor, Nikon, etc., will have them, but the ** will be relatively high.

It is recommended to choose the ordinary brand in the store, six, the ordinary ultra-thin (the resin lens will have some thickness, the lens that can be selected will be relatively thinner, ** around 300-400, and the thinner and the lens, each store** is also different, you can choose one in two or three stores.

It's okay in general, don't be too small to see the eyes

The difference between glasses and and and is in the thickness of the lens: <<

This refers to the refractive index of the lens, the higher the refractive index, the thinner the thickness of the lens, that is, the thinner.

Plastic lenses are only , this is the refractive index of plastic lenses, the higher the refractive index, the thinner and more beautiful the lens. The common glasses lenses on the market are roughly divided into glass sheets, resin films, and cosmic films (commonly known as: PC films, space films) according to the material.

Usually the refractive index of the lens is marked, and the higher the refractive index, the thinner the lens with the same luminosity.

Plastic lenses are becoming more and more popular, and due to their impact resistance and fragility, lenses can be made thinner and can be paired with rimless and half-rim frames without any problems. On the other hand, the strengths are also the weaknesses.

It is not easy to break because of its low hardness, so the surface of the lens is not good enough to wear and can be easily scratched. Although it can be hardened and filmed, it still needs to be carefully protected to maintain a long life. Therefore, high-fold lenses, lenses are also a good choice for patients with high myopia.

Since there are only one or two manufacturers of high-fold glass lenses in China, the lenses need to be customized according to the power of consumers.

The selection of spectacle lenses is as follows:

1. Choose lens material. Lens materials are mainly divided into glass, resin and PC, although the optical properties of glass lenses are good, but fragile, there are hidden dangers to eye health, and there are very few people with glass lenses now. More and more people are choosing resin lenses, both for performance and health reasons.

It's all good. Plastic lenses are more expensive than glass and PC lenses, but there are also grades of plastic lenses.

2. Choose the spherical nature of the lens. As people's understanding of the eye deepens, they find that our eyes themselves are not a normal spherical shape, so the lenses that adapt to this non-normal spherical eye are called aspherical lenses.

Aspherical lenses can help us achieve better visual quality, and aspherical lenses are also thinner and clearer than spherical lenses of the same power, which is suitable for people with height.

3. Select the refractive index of the lens.

The lenses are marked with .A value of 74 refers to the refractive index, and the higher the refractive index, the thinner the lens with the same power. ** Will also climb significantly. Moreover, the higher the refractive index, the dispersion.

The more powerful, the more visual effects will be reduced.

It is to choose a suitable spectacle frame, because it has to accompany us every day, comfortable, safe, durable, beautiful, cost-effective are indispensable.

The choice of spectacle lenses should be based on the condition of your own eyes and diopter. First of all, look at the lens material of glasses, now there are three main materials for spectacle lenses, glass, resin and PC lenses.

The advantage of glass is that the light transmittance is good, not easy to yellow, **cheap, in all the same material, the same power of the lens it is the thinnest, however, there is one biggest disadvantage is that it is easy to break, for children, wearing glass lenses is very unsuitable, easy to produce fragments to hurt the eyes, this lens has gradually disappeared from the market.

Resin lenses have good light transmittance, yellowing rate is in the middle, and various films can be coated on the surface, and there is a disadvantage that the resin lens is thicker than the same power PC lens and myopia lens, and it is not recommended to choose resin for the height of the spectacle lens, because the resin will appear particularly thick.

PC film is also called cosmic film, good light transmittance, low yellowing rate, high refractive index, the biggest advantage is that it is not easy to become fragments after trauma to pierce the eyes, the United States FDA hard regulations that children under the age of 18 with glasses can only be equipped with PC films, but PC films have a disadvantage, that is, they are relatively soft and easy to wear.

How to choose lenses:

1. Light weight of lenses: The lenses of myopia glasses should try to choose some new materials, which make the lenses lighter, such as PC lenses, which are very light and suitable for patients with high myopia or moderate myopia. Traditional glass lenses have a better refractive index to see things, and the ratio is clearer, but because it is too heavy, it is easier for people to feel heavy.

2. The lens has strong impact resistance: myopia lenses should choose lenses with strong impact resistance, especially for children, it is easy to break the lenses, which is more dangerous and will accidentally cut the eye tissue.

3. Moderate refractive coefficient of lenses: try to choose lenses with moderate refractive coefficient, such as high myopia or ultra-high myopia patients, the refractive coefficient is higher, which means that the lens will be thinner, that is, its weight will be smaller, and the overall feeling will be much better.

Lens selection is based on the specific prescription, wearing parameters, use scenarios, habits, and functional selection, if you need to pursue quality and visual quality, it is recommended to choose personalized customized lenses.

It is better to choose natural crystal lenses, optical reed glass lenses and optical resin lenses for spectacle lenses.

Because different types of lenses have different Youqiao Xiao Burning Point, you can't say which lens is better, you can only choose the most suitable one, as follows:

1. Natural crystal lenses, such lenses have high hardness, wear resistance, high light transmittance and refractive index, which can bring the wearer a comfortable visual experience.

2. Optical glass lens, optical glass lens has scratch resistance, good light transmittance and mechanical and chemical properties of the lens, light weight, easy to carry.

3. Optical resin lenses, this kind of lens has strong toughness and is not easy to break, and due to the low conductivity of plastic lenses, the anti-fog function of this type of glasses is stronger.

Precautions for glasses

1. Choosing a professional optical store is the first step, don't go to a street store, because the quality of their products may not be good even if you fool you.

2. Know your refractive situation, combined with your age, if it is the first time to dispense glasses, then you should consider progressive multifocal lenses, if the optometrist does not use a comprehensive refractor for refraction, and does not conduct a very professional examination, then the adolescent myopia prevention and control glasses should not be easily chosen.

3. When choosing, the frame generally chooses your favorite style, the material is OK, if you like the international first-line brand, then you can search on the Internet, as long as it is not too expensive, it is also acceptable, after all, the cost of opening a store is higher than that of the Internet.

Let me share a few thoughts based on my experience:

1.Choose lenses with different refractive indices according to your reading. If the prescription is 500 degrees and above, it is recommended to choose a refractive index, so that the glasses lens is thinner, looks better, and is not too bulky, and it is more comfortable to wear. Zheng and He.

2.If it is a power below 500, the refractive index is OK or that, because the power is low, the lens itself will not be very bulky, nor will it be very thick.

3.In terms of branding, it is recommended to choose ordinary three or four lines. Because the old brand of jujube is big and high. Moreover, glasses are consumables, and the prescription changes after 2-3 years, and they need to be replaced.

Thickness is an important consideration when choosing spectacle lenses. The following is an explanation and differences between lenses and lenses:

and refer to the refractive index of the lens, respectively. The higher the refractive index, the thinner the thickness of the lens at the same power. In general, high refractive index lenses are suitable for patients with higher degrees of myopia or astigmatism, which can reduce the thickness and weight of the lenses.

In your case, with 450° myopia and 50° astigmatism, you can consider the following:

Refractive index: The refractive index of the lens is higher, so the lens of the same power will be thinner than the lens. This may mean that the lenses will look better for your prescription.

Lens thickness: Since your prescription is relatively high, choosing high refractive index lenses may make the lenses thinner, reducing the weight of the glasses and the appearance of thickness.

Cost: The lenses** are higher, while the lenses** are relatively low. This is due to the use of higher-cost materials and manufacturing techniques for permeable lenses. Therefore, you need to weigh the relationship between ** and the thickness of the lens.

The final choice depends on your personal preference and budget. If you have high requirements for the appearance and thickness of your lenses and are willing to pay more, then lenses may be a suitable choice. If you pay more attention to **, and you don't have much concern about the thickness of the appearance, then the lens can also be an affordable choice.

The best advice is to consult with the professionals at the optician, who can give more specific recommendations and recommendations depending on your needs and budget.

Unlike the refractive index of spectacle lenses, the higher the refractive index, the thinner the lenses. The refractive index is higher than the refractive index, so at the same power, the spectacle lens will be thinner.

However, choosing which thickness of spectacle lenses to choose also takes into account your individual needs and budget. If you need thinner spectacle lenses, then you can opt for them; If you don't have a special requirement for thickness, then it can also meet your needs. Of course, ** is also one of the factors to be considered.